Basileus
（重定向自Basilius）
![A silver coin of the Seleucid king Antiochus I Soter. The reverse shows Apollo seated on an omphalos. The Greek inscription reads ΒΑΣΙΛΕΩΣ ΑΝΤΙΟΧΟΥ (of the king Antiochus).](/Images/godic/202412/23/AntiochusI0851.jpg")
![Bronze follis of Leo VI the Wise (r. 886–912). The reverse shows the Latin-transcribed Greek titles used in imperial coinage: +LEOn En ΘEO bASILEVS ROMEOn,](/Images/godic/202412/23/Follis-Leo_VI-sb17290851.jpg")
![Early 15th-century miniature depicting Emperor Manuel II Palaiologos with his family: empress Helena Dragaš, and three of their sons, John, Andronikos and Theodore. The full imperial title uses both typically Byzantine and revived archaic Roman elements: ΜΑΝΟΥΗΛ ΕΝ ΧΩ ΤΩ ΘΩ ΠΙCΤΟC ΒΑCΙΛΕΥC ΚΑΙ ΑΥΤΟΚΡΑΤΩΡ ΡΩΜΑΙΩΝ Ο ΠΑΛΑΙΟΛΟΓΟC ΚΑΙ ΑΕΙ ΑΥΓΟΥCΤΟC,](/Images/godic/202412/23/Manuel_II_Helena_sons0851.JPG")
![1876 five-drachma coin, bearing a bust of George I of Greece and the legend ΓΕΩΡΓΙΟΣ Α! ΒΑΣΙΛΕΥΣ ΤΩΝ ΕΛΛΗΝΩΝ,](/Images/godic/202412/23/5dracme1874front0851.jpg")
Basileus (Greek:βασιλεύς) is a Greek term and title that has signified various types of monarchs in history. In the English-speaking world it is perhaps most widely understood to mean "King" or "Emperor". The best known use of the title is by the Byzantine emperors, but the title also has a longer history of use by sovereigns and other persons of authority in ancient Greece, as well as for the kings of modern Greece.